NAPP - The National Association of Photoshop Professionals

B & H - My favorite "toy store". From beginners to pros, camera, video, electronics...

Digital PhotographyReview - In-depth camera reviews and forums

sensor-size.com - A website with a digital sensor size calculator. Conversions between ratio and millimeters. Here is a link to David Pogue's original article in the NY Times

Archival Methods - Archival quality page protectors, binders and supplies for storing photos and negatives.

American Printing and Envelope Company - They make photo mailers up to 17" x 22". They consist of an envelope with string closure and two pieces of cardboard. The corrugations in the two pieces of cardboard are at right angles to prevent bending in transit.